Google Analytics is a service offered by Google that generates detailed statistics about a website's traffic and traffic sources and measures conversions and sales. Google Analytics can track visitors from all referrers, including search engines and social networks, direct visits and referring sites. It also displays advertisin...
Websites using some form of Captcha technology on them.
Stripe is a developer-friendly way to accept payments online and in mobile apps.
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.